Get the runmask attribute from a spawn attributes object
#include <spawn.h>
int posix_spawnattr_getrunmask(
const posix_spawnattr_t *_Restrict attrp,
uint32_t *_Restrict runmask_p);
libc
Use the -l c option to qcc to link against this library. This library is usually included automatically.
The posix_spawnattr_getrunmask() routine retrieves the current value of the runmask attribute from the given spawn attributes object. You must have already initialized the spawn attributes object by calling posix_spawnattr_init().
This attribute is a bitmask of the processors that the spawned program can run on. Processor numbering starts at 0, with each processor corresponding to a bit in the runmask. For example, a runmask of 0x00000005 indicates that the spawned process is restricted to CPUs 0 and 2. For more information, see the Multicore Processing chapter of the QNX Neutrino Programmer's Guide.
This setting takes effect only if the POSIX_SPAWN_EXPLICIT_CPU flag is set; to set this flag, call posix_spawnattr_setxflags(). The default mask is 0xFFFFFFFFU, indicating that the spawned process can run on any processor.
To set the value of this attribute, call posix_spawnattr_setrunmask().
For more information about spawn attributes, see the entry for posix_spawn().
| Safety: | |
|---|---|
| Cancellation point | No |
| Interrupt handler | Yes |
| Signal handler | Yes |
| Thread | Yes |